Heavy Fuel and Gasoline Engines for Unmanned Aerial Systems
SP-55 TS ROS Two-Stroke Engine Single-cylinder UAS engine
SP-55 TS ROS Two-Stroke Engine

Single-cylinder UAS engine

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SP-55 TS ROS Two-Stroke Engine

The SP-55 TS ROS 2-stroke single cylinder with 55 ccm is the largest single cylinder engine in the Sky Power lineup. It is equipped in the standard configuration with a twin ignition unit. The carburetor is top mounted.

It is designed with twin spark plugs and a top-mounted carburetor. The Rear Output Shaft (ROS) makes this engine one of the most compact one-cylinder engines on the market.

Because of the rear output shaft, a generator can be mounted on the back of the engine.

The engine is used by customers for fixed wing, heli and VTOL aircraft on the upper end of the ‘below 55 lb’ or ‘up to 25 kg’ class UAS as well as hybrid configurations to produce electricity.

The cylinder is casted aluminum and has been manufactured in its current form for over ten years. The Crankcase is CNC machined in order to be able to adjust customer specific parts to it.

Type 1-Cylinder Gas Engine
Capacity 55 ccm / 3.35 cu in
Power 3.9 HP / 2.9 KW @ 6500 RPM
Speed Range 2200 – 10000 RPM
Weight incl. ignition 5.68 lbs (2.58 kg)
Crankshaft 4 ball bearings
Oil/Gasoline ratio 1:50 / 2% mix
Operating Voltage 6 – 8.4 V DC
Bore diameter 1.77 inch (45.00 mm)
Stroke 1.38 inch (35.00 mm)
Torque 4.7 Nm @ 5500 RPM